Could you help me on setting permissions on a Windows file server folder in a Domain?@Driftpeasant Oh no! It was just a match between me and ACEs to let things work properly (or almost) =). I've created a "test" structure that emulates the actual "folder A" and I've done tests on it .. Now I have to call my collegue and to structure its folder as best practice (and you) tells. The max I have obtained is: - Users can save the Excel file but can even create and delete other "Folder A" files. Although they cannot modify other "Folder A" files. I think that ACEs lesson could finish here! :)